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Atmosphere > Composition > Carbon Dioxide, Methane and other Greenhouse Gases
Carbon Dioxide, Methane and other Greenhouse Gases  
  • Carbon dioxide (CO2) is a naturally occurring Greenhouse gas, but one whose abundance has been increased substantially above its pre-industrial value of some 280 ppm by human activities, primarily because of emissions from combustion of fossil fuels, deforestation and other land-use change. Methane (CH4) is the second most significant of the greenhouse gases that have increased in concentration in the atmosphere directly due to human activities, from the viewpoint of the radiative forcing of climate change . The set of other greenhouse gases include nitrous oxide (N2O), sulphur hexafluoride (SF6) and groups of species categorised as chlorofluorocarbon (CFCs), hydrofluorocarbons (HFCs), hydrochlorofluorocarbons (HCFCs) and perfluorocarbons (PFCs). All have anthropogenic sources and none has a substantial tropospheric sink. Only N2O has a significant natural source. N2O, the CFCs and the HCFCs are the species involved in ozone depletion.
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